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Module 2 of 5

Module 2 — Opportunity Validation & Market Research

Customer discovery interviewsProblem-solution fitMarket sizing: TAM, SAM, SOMCompetitive landscape mapping

Customer Discovery & Problem-Solution Fit

Before building anything, entrepreneurs must validate that a real problem exists and that customers will pay for a solution. Customer discovery (Steve Blank) is the process of leaving the building and talking to potential customers to test your assumptions.

The goal is to achieve problem-solution fit: confirming that you've identified a genuine problem worth solving and that your proposed solution resonates with the target customer. This comes before product-market fit, which confirms that the market actually wants and buys your product.

Effective customer discovery interviews follow key principles: ask about past behaviour (not hypothetical future behaviour), listen more than you talk, avoid pitching your solution, look for patterns across conversations, and focus on understanding the customer's world rather than validating your idea. Rob Fitzpatrick's "The Mom Test" teaches that you should ask questions so good that even your mother couldn't give you a false positive.

Market Sizing: TAM, SAM, SOM

Investors and strategic planners use three concentric circles to understand market potential:

TAM (Total Addressable Market): The entire revenue opportunity available if a product achieves 100% market share. For an edtech product, TAM might be the global spending on professional development.

SAM (Serviceable Addressable Market): The segment of TAM targeted by your product within your geographic and capability reach. For the same edtech product, SAM might be online professional development in English-speaking markets.

SOM (Serviceable Obtainable Market): The realistic portion of SAM you can capture in the near term given your resources, brand, and competitive position. This is your actual target.

Market sizing can be done top-down (starting from industry reports and narrowing down) or bottom-up (starting from unit economics: number of potential customers × price × purchase frequency). Bottom-up is generally more credible because it forces you to make specific, testable assumptions.

Competitive Landscape Mapping

Understanding your competitive landscape goes beyond listing direct competitors. A comprehensive analysis considers:

Direct competitors: Firms offering similar solutions to the same customer problem. Indirect competitors: Firms solving the same problem differently (e.g., a gym vs. a home workout app vs. a personal trainer). Substitute solutions: How customers currently solve the problem without your product (including doing nothing).

A competitive positioning map plots competitors along two dimensions most important to customers (e.g., price vs. quality, simplicity vs. feature richness). This visual tool reveals gaps in the market — underserved positions that represent opportunity.

Key questions: What are competitors' strengths and weaknesses? What do their customers love and hate (review mining)? What's their pricing model? How are they acquiring customers? Where are the gaps in their offering?

Remember: having no competitors is rarely good news. It usually means there's no market. The best position is one where competitors validate the market while leaving meaningful gaps for your differentiated approach.

Key Takeaways

  • Customer discovery interviews validate problems before solutions are built
  • Problem-solution fit precedes product-market fit
  • TAM/SAM/SOM sizing moves from total opportunity to realistic target
  • Bottom-up market sizing is more credible than top-down estimates
  • Competitive analysis should include direct, indirect, and substitute solutions

Exercises & Activities

practical

Customer Interview Design

Design 5 customer discovery interview questions for a business idea of your choice. Ensure questions follow 'The Mom Test' principles: ask about past behaviour, avoid leading questions, and don't pitch your solution. Explain why each question is effective.

case study

Market Sizing Exercise

Calculate TAM, SAM, and SOM for a hypothetical online language learning platform targeting professional adults in Europe. Show your assumptions and calculations using a bottom-up approach. What market share would you need to reach $1M in annual revenue?

Interactive AI Tutor Session

Copy this prompt and paste it into your preferred AI assistant (ChatGPT, Claude, Gemini) to begin your interactive tutoring session for this module.

"You are a lean startup coach. Teach the student how to validate a business idea before building anything. Explain customer discovery interviews and problem-solution fit. Guide them through calculating TAM, SAM, and SOM for a hypothetical edtech product. Ask them to design 5 customer interview questions for their own idea."